Rolling mill



J. @ASSEN prl 28, 3936.

ROLLING MILL original Filed oct. 27, 1932 NVENTOR @d @fi/V ATTRNEY @fg j?! BY Patented Apr. 28, 1936 UNITED STATES PATENT GFFICE Schloemann Aktiengesellschaft,

Dusseldorf,

Germany, a corporation of Germany Original application October 27, 1932, Serial No.

639,804. Divided and this application September 28, 1933, Serial No. 691,279. In Germany October 29, 1931 Claims.

My invention relates to rolling mills, and more particularly to rolling mills for the continuous rolling of wire or small bars (billets), such as described in my application Serial No. 639,804, filed on October 27, 1932 of which this application is a division. The main difficulty encountered in wire rolling mills has been that it has been impossible to precisely and accurately regulate the speed of the rolls in the various housings, especially the speed of the finishing rolls relative to the speed of the rolls in the adjacent housings. This difficulty has been caused by the large rotating masses, which make regulation very hard, especially in View of the high speeds of the rolls, even where a separate motor has been used for each housing.

To entirely overcome the said difliculty, is the object of the present invention, according to which the housings are so designed that each roll of every housing is directly driven by a separate electric motor, whereby the rotating masses of the housing are reduced to a fraction of the masses heretofore used.

According to the present invention, the rolls are driven by electric motors having the magnet casings thereof combined to form a single magnet casing which is laterally connected with the roll housing to form a unitary combination, the two armatures being arranged with their shafts vertically one above the other. Under these circumstances the two motor armatures are traversed by the same flux generated by the shunt winding, and the windings of the two armatures are connected in series, so that the two motors will develop the same torques at equal speeds, the result being absolutely uniform operation.

Because of the reduction of the rotating masses, the same will more quickly respond to regulation and thus, the speeds of the rolls of the various housings can be accurately and correctly adjusted, which is the more necessary, the higher the speeds of the rolls. Also, in the event of any danger, or in case of any accidents, the rotating masses can be stopped very quickly,

as for instance by means of readily accessible push buttons.

As a further advantage may be mentioned the fact that the new constructions require considerably less space than the old constructions.

On the annexed drawing, on which, by way of illustration, various embodiments of my invention are shown,

Fig. 1 is an elevation, partly in section, of a roll housing, combined with a magnet casing,

Fig. 2 is an end view of this construction;

(Cl. Sil-54) Figs. 3 and 4 are similar views as Figs. 1 and 2, showing a modification.

Figs. 1 and 2 show the combination of a roll housing with a magnet casing, wherein the two motor armatures are disposed vertically one above the other.

The roll housing, which is indicated at I contains the rolls 2 and 2a and the bearing members 3. With one side of the roll housing is connected the common magnet casing 1, to which are rigidly secured the bearings 8. In these bearings are rotatably journalled, being vertically disposed one above the other, the shafts 9 and 9 and the two motor armatures I0 and I0. Within the magnet casing 1 are provided the pole shoes II and I2 carrying the exciting windings I3 and I4 respectively. Within the magnet casing is also provided a double pole shoe shown at I5, held in position by bridge pieces I6 of non-magnetic material. The motor armatures I0 and I0 are disposed in close proximity to each other, and the flux generated by the shunt windings I3 and I4 traverses both armatures in the direction of the arrows by passing across the double pole shoe I5. The two armature windings are connected in series so that the same currents flow in both, and since the ux traversing the two armatures, is also the same, both motors develop equal torques at equal speeds, so that an absolute uniform operation is insured. The shafts of the two motors are connected with the journals I'I of the rolls 2 and 2a by yielding couplings I8 of well-known construction so that the rolls, if necessary, can be freshly turned and readjusted. This construction is used, if for the rolling operation torques are required, which can be produced with armature diameters that may be smaller than the diameters of the driven rolls.

In Figs. 3 and 4 is illustrated the combination of a housing with a magnet casing, in which the two motor shafts are disposed vertically one above the other, but in which the motor armatures are laterally offset relative to each other. They are so closely disposed that between the armature of the one motor and the shaft of the other motor there still remains a space about double the space between magnet pole and armature. In the housing shown at Ib are provided the rolls shown at 2c and 2d and the bearing members shown at 3b. With the housing Ib are rigidly connected the common magnet casing I9 and the bearings for the motor shafts 2| and 2l. The latter, corresponding to the mean distance between the two rolls 2c and 2d, are disposed vertically one above the other, While the two motor armatures 22 and 22 secured to shafts 2l and 2 I respectively, are horizontally oiTset relative to each other because of their large diameters.

In the magnet casing, the pole shoes 23 and 24, with their exciting windings 25 and 26 respectively are disposed in staggered relation to each other. The magnetic flux, also in this instance,

successively traverses the two armatures in the directions of the armatures and, therefore, is al- Ways the same in both. Because of the simultaneous series connection of the windings of both armatures, also in this construction the same peripheral speed with the same peripheral forces is produced.

The shafts of the motors are connected with the journals 21 of the rolls by means of a flexible coupling 28 of well-known construction, so that the rolls, if necessary, can be freshly turned and adjusted. The construction is selected, where, for the purpose of producing the required torques, the diameters of the armatures 22 must be greater than those of the driven rolls. The diameters of the armatures may be made as large as is permitted by the shaft of the adjacent armature, whereby the maximum torque is obtained, Which with a given diameter of the rolls can possibly be obtained.

While I have shown several embodiments of my invention, the same is, of course, not limited thereto, since various modifications may be proposed without departure from the gist of the invention.

I claim:

1. An electric motor, comprising a single magnet casing, two shafts journalled in said casing in close superposed relation, armatures carried by said shafts being offset relative to each other along their axis of rotation, and windings for said armatures provided in said casing.

2. An electric motor, comprising a single magnet Casing, two shafts journalled in said casing in close superposed relation, armatures carried by said shafts being offset relative to each other along their axis of rotation, serially connected windings for said armatures provided in said casing, and pole pieces in said casing, said armatures being so disposed relative to said pole pieces as to be traversed by the same magnetic flux.

3. In a rolling mill, the combination with a roll housing and cooperating rolls journalled therein, of a single magnet casing rigidly connected with said housing in lateral relation thereto, two shafts journalled in said casing one above the other, yielding couplings operatively connecting said shafts with the journals of said cooperating rolls, an armature carried on each of said shafts in close proximity to each other, and pole pieces for said armatures including windings so as to cause the same magnetic ux to traverse said armatures.

4. 'I'he combination as specified in claim 3, in which said windings are connected in series.

5. The combination as specified in claim 3, in-

cluding bearings for the outwardly projecting ends of said shafts being secured to opposite sides of said magnetic casing.

JOSEF GASSEN. 

